402044404421 has 16 divisors (see below), whose sum is σ = 444564868608. Its totient is φ = 360532729200.

The previous prime is 402044404369. The next prime is 402044404427. The reversal of 402044404421 is 124404440204.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402044404421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402044404427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250406 + ... + 931016.

It is an arithmetic number, because the mean of its divisors is an integer number (27785304288).

Almost surely, 2^402044404421 is an apocalyptic number.

It is an amenable number.

402044404421 is a deficient number, since it is larger than the sum of its proper divisors (42520464187).

402044404421 is a wasteful number, since it uses less digits than its factorization.

402044404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681352.

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 402044404421 its reverse (124404440204), we get a palindrome (526448844625).

The spelling of 402044404421 in words is "four hundred two billion, forty-four million, four hundred four thousand, four hundred twenty-one".